NORMAN LEADS BY 3 IN CANADA

Greg Norman, the defending champion, chipped into the 16th hole from 25 feet for an eagle 3 today and finished with a three-shot lead after two rounds of the 76th Canadian Open.

Chipping and blasting with excellent results all day, the 30-year-old Australian, known as the Shark, carded four-under-par 68 on the windy 7,102-yard Glen Abbey Golf Club course for nine-under 135 after 36 holes. Curtis Strange, who shot 69, and Larry Mize, who shot six-under-par 66, were tied for second at 138.

Fuzzy Zoeller, who beat Norman in an 18-hole playoff for the 1984 United States Open championship at Winged Foot, was at 139 after shooting 66 today. He was tied for fourth place with Skeeter Heath.

Big Leap Ahead

Norman was tied for the lead after 12 holes today and gained a stroke on the field when he blasted out of a greenside bunker at 13 and sank the putt for a birdie 4.

That set the stage for a big leap ahead on the 516-yard, par-5 16th. His second shot put him in deep grass back of the green so he had a downhill pitch to the pin. He lifted the ball softly with his sand wedge and dropped it on the short fringe from where the ball trickled slowly down the remaining 10 feet to the cup.

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The 34-year-old Californian played with Brett Upper and David Ogrin in the first two rounds. This group fell back and was considered out of position because there was too much distance between it and the threesome up ahead. Sills and friends were warned at the 13th tee to pick up the pace and get back into position. Under PGA Tour rules, such a warning means each golfer in a tardy threesome is timed on each shot until the group gets back into position. If a player makes the mistake of taking more than 45 seconds for a shot on any four strokes, he incurs a $500 fine.

Mike Shea, the tour official who warned the players and then began timing them, assessed Sills a $500 fine when the golfer took too long on a putt at the 15th hole. That was, according to Shea, the fourth time since the 13th tee that Sills had taken over 45 seconds for a stroke.

Fine Is Criticized

But Sills thought he had been unfairly fined.

''The third time I was supposed to have taken over 45 seconds came when I was hitting my tee shot at 15,'' Sills said. ''Just as I was ready to hit, a marshall walked across the tee 10 feet behind me so I stepped back. Then, as I addressed the ball again, this marshall raised his hat in the air and that distracted me, also.''

Shea, a former player on the tour who has been an official for the last six years, said Sills's appeal was justified. ''I was behind some trees when I was timing him and did not see the interference from the marshall,'' he said.

Another ruling did hold, because there was no recourse for appeal. Mike Gove was disqualified for an improper drop after his tee shot at the par-3 third hole landed in a water hazard. He hit his third shot from the wrong location. ----Alcott Leads by 4 SUGAR LAND, Tex., July 5 (AP) - Amy Alcott, the first-day leader, birdied five of the final six holes for a four-under-par 68 today and extended her lead to four shots after two rounds of the $300,000 Mazda Hall of Fame Championship.

Miss Alcott shot a three-under-par 69 in Thursday's rain-plagued first round and had a 36-hole total of 137, seven-under-par and four shots ahead of Nancy Lopez, who birdied the final hole for a 70 and a 141 total.

JoAnne Carner also had a two-under-par 70 over the 6,470-yard Sweetwater Country Club course for a 142 total in third place.

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A version of this article appears in print on July 6, 1985, on Page 1001041 of the National edition with the headline: NORMAN LEADS BY 3 IN CANADA. Order Reprints|Today's Paper|Subscribe